libgender/util.h

#ifndef UTIL_H
#define UTIL_H

#include <cmath>
#include <cfloat>
#include <cstdlib>
#include <vector>
#include <string>

#include "opengl.h"

#include <SDL/SDL_image.h>

using namespace std;

typedef long long soffs; // 32 bit
typedef unsigned long long uoffs;
#define OFFS_BITS 63
#define SOFFS_MIN (soffs)-(1LL << (OFFS_BITS - 2))
#define SOFFS_MAX (soffs)+(1LL << (OFFS_BITS - 2))
#define MAXEXTENT (1ULL << (OFFS_BITS - 1))

#define ABS(n) ((n) < 0 ? -(n) : (n))

struct sector
{
  soffs x, y, z;

  sector (soffs x, soffs y, soffs z) : x(x), y(y), z(z) { };
  sector (soffs xyz = 0) : x(xyz), y(xyz), z(xyz) { };

  void offset (int subindex, uoffs extent)
  {
    if (subindex & 1) x += extent;
    if (subindex & 2) y += extent;
    if (subindex & 4) z += extent;
  }
};

inline sector operator +(const sector &a, const sector &b)
{
  return sector (a.x + b.x, a.y + b.y, a.z + b.z);
}

inline sector operator -(const sector &a, const sector &b)
{
  return sector (a.x - b.x, a.y - b.y, a.z - b.z);
}

inline sector operator /(const sector &a, soffs b)
{
  return sector (a.x / b, a.y / b, a.z / b);
}

inline sector operator >>(const sector &a, unsigned int b)
{
  return sector (a.x >> b, a.y >> b, a.z >> b);
}

inline bool operator <=(const sector &a, const sector &b)
{
  return a.x <= b.x && a.y <= b.y && a.z <= b.z;
}

inline soffs max (const sector &a)
{
  return max (a.x, max (a.y, a.z));
}

inline sector translate (const sector &p, const sector &src, const sector &dst)
{
  return p + (dst - src);
}

inline sector abs (const sector &s)
{
  return sector (ABS (s.x), ABS (s.y), ABS (s.z));
}

struct vec2
{
  GLfloat x, y;
  vec2 () { };
  vec2 (GLfloat s) : x(s), y(s) { };
  vec2 (GLfloat x, GLfloat y) : x(x), y(y) { };
};

struct vec3
{
  GLfloat x, y, z;
  vec3 () { };
  vec3 (GLfloat s) : x(s), y(s), z(s) { };
  vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
  vec3 (const sector &s) : x(s.x), y(s.y), z(s.z) { };

  const vec3 operator -() const
  { return vec3 (-x, -y, -z); }
};

const vec3 normalize (const vec3 &v);
const vec3 cross (const vec3 &a, const vec3 &b);

inline const vec3 operator *(const vec3 &a, GLfloat s)
{
  return vec3 (a.x * s, a.y * s, a.z * s);
}

inline const vec3 operator +(const vec3 &a, const vec3 &b)
{
  return vec3 (a.x + b.x, a.y + b.y, a.z + b.z);
}

inline const vec3 operator -(const vec3 &a, const vec3 &b)
{
  return vec3 (a.x - b.x, a.y - b.y, a.z - b.z);
}

inline GLfloat dot (const vec3 &a, const vec3 &b)
{
  return a.x * b.x + a.y * b.y + a.z * b.z;
}

// squared length
inline const GLfloat length2 (const vec3 &v)
{
  return dot (v, v);
}

inline const GLfloat length (const vec3 &v)
{
  return sqrtf (length2 (v));
}

typedef vec3 point;

struct vec4
{
  GLfloat x, y, z, w;
  vec4 () { };
  vec4 (GLfloat s) : x(s), y(s), z(s), w(s) { };
  vec4 (GLfloat x, GLfloat y, GLfloat z, GLfloat w) : x(x), y(y), z(z), w(w) { };
  vec4 (const vec3 &v, GLfloat w = 1.F) : x(v.x), y(v.y), z(v.z), w(w) { };
};

// a generic plane
struct plane
{
  vec3 n;
  GLfloat d;

  plane () { };
  plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d);
};

inline GLfloat distance (const plane &a, const point &p)
{
  return dot (a.n, p) + a.d;
}

struct sphere {
  point p;
  GLfloat r;

  sphere () { };
  sphere (const point &p, GLfloat r) : p(p), r(r) { };
};

inline bool overlap (const sphere &a, const sphere &b)
{
  GLfloat d = a.r + b.r;

  return length2 (a.p - b.p) <= d * d;
}

struct cone {
  point p;
  vec3 a; // axis
  GLfloat f, fs1, fc2; // angle

  cone () { };
  cone (const point &p, const vec3 &a, GLfloat f)
  : p(p), a(a), f(f)
  {
    fs1 = 1.F / sinf (f);
    fc2 = cosf (f); fc2 *= fc2;
  };
};

inline bool overlap (const cone &c, const sphere &s)
{
  vec3 d = s.p - c.p + c.a * (s.r * c.fs1);
  GLfloat dd = dot (c.a, d);
  return dd > 0.F && dd * dd >= length2 (d) * c.fc2;
}

void renormalize (sector &s, point &p);

struct colour
{
  GLubyte r, g, b, a;
  colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.)
  : r(GLubyte (r * 255.F + .5F))
  , g(GLubyte (g * 255.F + .5F))
  , b(GLubyte (b * 255.F + .5F))
  , a(GLubyte (a * 255.F + .5F))
  {
  }
};

struct tex2
{
  GLfloat s, t;
  tex2 () { };
  tex2 (GLfloat s, GLfloat t) : s(s), t(t) { };
};

template<typename unused> class gltype_traits { };

template<> struct gltype_traits<GLfloat > { static const GLenum gltype () { return GL_FLOAT; } };
template<> struct gltype_traits<GLdouble> { static const GLenum gltype () { return GL_DOUBLE; } };
template<> struct gltype_traits<GLint   > { static const GLenum gltype () { return GL_INT; } };
template<> struct gltype_traits<GLuint  > { static const GLenum gltype () { return GL_UNSIGNED_INT; } };
template<> struct gltype_traits<GLshort > { static const GLenum gltype () { return GL_SHORT; } };
template<> struct gltype_traits<GLushort> { static const GLenum gltype () { return GL_UNSIGNED_SHORT; } };
template<> struct gltype_traits<GLbyte  > { static const GLenum gltype () { return GL_BYTE; } };
template<> struct gltype_traits<GLubyte > { static const GLenum gltype () { return GL_UNSIGNED_BYTE; } };

template<typename vectype> class vector_traits { };

template<>
struct vector_traits<vec2>
{
  typedef GLfloat basetype;
  static const int dimension () { return 2; }
};

template<>
struct vector_traits<vec3>
{
  typedef GLfloat basetype;
  static const int dimension () { return 3; }
};

template<>
struct vector_traits<vec4>
{
  typedef GLfloat basetype;
  static const int dimension () { return 4; }
};

template<>
struct vector_traits<tex2>
{
  typedef GLfloat basetype;
  static const int dimension () { return 2; }
};

template<>
struct vector_traits<colour>
{
  typedef GLubyte basetype;
  static const int dimension () { return 4; }
};

struct box
{
  point a, b;

  box() { };

  void reset ()
  {
    a = point ( FLT_MAX,  FLT_MAX,  FLT_MAX);
    b = point (-FLT_MAX, -FLT_MAX, -FLT_MAX);
  }

  void add (const box &o);
  void add (const point &p);
};

struct entity;
struct geometry;
struct view;
struct octant;

extern struct timer
{
  static double now;
  static double diff;
  static double fps;

  static void frame ();
  timer ();
} timer;

/*
#define MAX_EVENT_TYPES 10
enum event_type { TIMER_EV };
struct event
{
   event_type type;
};

typedef callback1<void, event&> event_cb;

class skedjuhlar
{
   public:
// only 10 types for now
   private:
      vector <list<event_cb> > event_lists;
   
   public:
      skedjuhlar () {
         event_lists.resize (MAX_EVENT_TYPES, list<event_cb>());
      }
      
      void register_event_cb (const event_type &t, const event_cb &e) {
         event_lists[t].push_back (e);
      };
      void send_event (event &e) {
         list<event_cb> &l = event_lists[e.type];
         for (list<event_cb>::iterator it = l.begin (); it != l.end (); it++) {
            (*it)(e);
         }
      };
      void check_events () {
         while (!events.empty ()) {
            event &e = events.pop_front ();
            list<event_cb> &l = event_lists[e->name];
            for (list<event_cb>::iterator it = l.begin (); it !+ l.end (); it++) {
               (*it)(e);
            }
            delete e; // ugly slow? hai hai..... 183G
         }
      }
};

extern skedjuhlar main_scheduler;
*/

namespace gl
{
#ifdef DEBUG
  void errchk (const char *name, const char *args, const char *file, int line);
#endif

  struct vertex_v3f
  {
    point p; // vertex

    vertex_v3f () { };
    vertex_v3f (point p) : p(p) { };

    GLenum gl_format () const { return GL_V3F; }
  };

  struct vertex_t2f_n3f_v3f
  {
    tex2  t; // texture
    vec3  n; // normal
    point p; // vertex

    vertex_t2f_n3f_v3f () { }
    vertex_t2f_n3f_v3f (point p, vec3 n, tex2 t = tex2()) : p(p), n(n), t(t) { }

    GLenum gl_format () const { return GL_T2F_N3F_V3F; }
  };

  GLsizei format_stride (GLenum format);
  GLsizei format_offset_p (GLenum format);
  GLsizei format_offset_n (GLenum format);
  GLsizei format_offset_t (GLenum format);

  struct index_ushort
  {
    GLushort i;

    index_ushort () { }
    index_ushort (GLushort i) : i(i) { }

    GLenum gl_format () const { return GL_UNSIGNED_SHORT; }
  };

  struct matrix
  {
    GLfloat data[4][4];

    const GLfloat operator ()(int i, int j) const { return data[j][i]; };
    GLfloat &operator ()(int i, int j) { return data[j][i]; };

    operator GLfloat *() { return &data[0][0]; }

    void diagonal (GLfloat v);
    void clear () { diagonal (0.F); };
    void identity () { diagonal (1.F); };

    void print (); // ugly

    static matrix translation (const vec3 &v);
    static matrix rotation (GLfloat degrees, const vec3 &axis);
    static matrix scaling (GLfloat sx, GLfloat sy, GLfloat sz, GLfloat w = 1.F);

    matrix () { };
    matrix (GLfloat diag) { diagonal (diag); };
  };

  matrix operator *(const matrix &a, const matrix &b);
  vec3 operator *(const matrix &a, const vec3 &v);

  template<GLenum target>
  struct vertex_buffer_object {
    GLuint buffer;
    GLenum format;
    GLsizei count;

    bool alloc ()
    {
      if (buffer)
        return false;

      glGenBuffersARB (1, &buffer);
      return true;
    }

    void bind ()
    {
      glBindBufferARB (target, buffer);
    }

    template<class data>
    void set (const data *d, GLsizei count, GLenum usage = GL_STATIC_DRAW_ARB)
    {
      alloc ();
      format = d->gl_format ();
      this->count = count;
      vertex_buffer_object::bind ();
      glBufferDataARB (target, count * sizeof (data), d, usage);
    }

    template<class data>
    void set (const vector<data> &d, GLenum usage = GL_STATIC_DRAW_ARB)
    {
      set (&d[0], d.size (), usage);
    }

    void set (GLsizei bytes, GLenum usage = GL_DYNAMIC_DRAW_ARB)
    {
      alloc ();
      format = GL_ZERO;
      this->count = bytes;
      vertex_buffer_object::bind ();
      glBufferDataARB (target, count, 0, usage);
    }

    void *map (GLenum access = GL_WRITE_ONLY)
    {
      vertex_buffer_object::bind ();
      return glMapBufferARB (target, access);
    }

    void unmap ()
    {
      vertex_buffer_object::bind ();
      glUnmapBuffer (target);
    }

    vertex_buffer_object ()
    : buffer(0)
    {
    }
    
    ~vertex_buffer_object ()
    {
      if (buffer)
        glDeleteBuffersARB (1, &buffer);
    }

    operator GLint ()
    {
      return buffer;
    }
  };

  struct vertex_buffer : vertex_buffer_object<GL_ARRAY_BUFFER_ARB> {
    void bind ()
    {
      vertex_buffer_object<GL_ARRAY_BUFFER_ARB>::bind ();
      if (format)
        glInterleavedArrays (format, 0, 0);
    }

    void draw (GLenum mode, GLint first, GLsizei count)
    {
      bind ();
      glDrawArrays (mode, first, count);
    }
  };

  struct index_buffer : vertex_buffer_object<GL_ELEMENT_ARRAY_BUFFER_ARB> {
    void draw (GLenum mode, GLint first, GLsizei count)
    {
      bind ();
      glDrawElements (mode, count, format, (GLushort*)0 + first); // only SHORT supported :( // first //D//TODO
    }
  };

  void draw_bbox (const sector &a, const sector &b);

}

GLuint SDL_GL_LoadTexture (SDL_Surface *surface, GLfloat *texcoord);

#endif

Revision:	1.55
Committed:	Fri Oct 29 23:19:08 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.54:	+24 -2 lines
Log Message:	* empty log message *
#	Content
1	#ifndef UTIL_H
2	#define UTIL_H
3
4	#include <cmath>
5	#include <cfloat>
6	#include <cstdlib>
7	#include <vector>
8	#include <string>
9
10	#include "opengl.h"
11
12	#include <SDL/SDL_image.h>
13
14	using namespace std;
15
16	typedef long long soffs; // 32 bit
17	typedef unsigned long long uoffs;
18	#define OFFS_BITS 63
19	#define SOFFS_MIN (soffs)-(1LL << (OFFS_BITS - 2))
20	#define SOFFS_MAX (soffs)+(1LL << (OFFS_BITS - 2))
21	#define MAXEXTENT (1ULL << (OFFS_BITS - 1))
22
23	#define ABS(n) ((n) < 0 ? -(n) : (n))
24
25	struct sector
26	{
27	soffs x, y, z;
28
29	sector (soffs x, soffs y, soffs z) : x(x), y(y), z(z) { };
30	sector (soffs xyz = 0) : x(xyz), y(xyz), z(xyz) { };
31
32	void offset (int subindex, uoffs extent)
33	{
34	if (subindex & 1) x += extent;
35	if (subindex & 2) y += extent;
36	if (subindex & 4) z += extent;
37	}
38	};
39
40	inline sector operator +(const sector &a, const sector &b)
41	{
42	return sector (a.x + b.x, a.y + b.y, a.z + b.z);
43	}
44
45	inline sector operator -(const sector &a, const sector &b)
46	{
47	return sector (a.x - b.x, a.y - b.y, a.z - b.z);
48	}
49
50	inline sector operator /(const sector &a, soffs b)
51	{
52	return sector (a.x / b, a.y / b, a.z / b);
53	}
54
55	inline sector operator >>(const sector &a, unsigned int b)
56	{
57	return sector (a.x >> b, a.y >> b, a.z >> b);
58	}
59
60	inline bool operator <=(const sector &a, const sector &b)
61	{
62	return a.x <= b.x && a.y <= b.y && a.z <= b.z;
63	}
64
65	inline soffs max (const sector &a)
66	{
67	return max (a.x, max (a.y, a.z));
68	}
69
70	inline sector translate (const sector &p, const sector &src, const sector &dst)
71	{
72	return p + (dst - src);
73	}
74
75	inline sector abs (const sector &s)
76	{
77	return sector (ABS (s.x), ABS (s.y), ABS (s.z));
78	}
79
80	struct vec2
81	{
82	GLfloat x, y;
83	vec2 () { };
84	vec2 (GLfloat s) : x(s), y(s) { };
85	vec2 (GLfloat x, GLfloat y) : x(x), y(y) { };
86	};
87
88	struct vec3
89	{
90	GLfloat x, y, z;
91	vec3 () { };
92	vec3 (GLfloat s) : x(s), y(s), z(s) { };
93	vec3 (GLfloat x, GLfloat y, GLfloat z) : x(x), y(y), z(z) { };
94	vec3 (const sector &s) : x(s.x), y(s.y), z(s.z) { };
95
96	const vec3 operator -() const
97	{ return vec3 (-x, -y, -z); }
98	};
99
100	const vec3 normalize (const vec3 &v);
101	const vec3 cross (const vec3 &a, const vec3 &b);
102
103	inline const vec3 operator *(const vec3 &a, GLfloat s)
104	{
105	return vec3 (a.x * s, a.y * s, a.z * s);
106	}
107
108	inline const vec3 operator +(const vec3 &a, const vec3 &b)
109	{
110	return vec3 (a.x + b.x, a.y + b.y, a.z + b.z);
111	}
112
113	inline const vec3 operator -(const vec3 &a, const vec3 &b)
114	{
115	return vec3 (a.x - b.x, a.y - b.y, a.z - b.z);
116	}
117
118	inline GLfloat dot (const vec3 &a, const vec3 &b)
119	{
120	return a.x * b.x + a.y * b.y + a.z * b.z;
121	}
122
123	// squared length
124	inline const GLfloat length2 (const vec3 &v)
125	{
126	return dot (v, v);
127	}
128
129	inline const GLfloat length (const vec3 &v)
130	{
131	return sqrtf (length2 (v));
132	}
133
134	typedef vec3 point;
135
136	struct vec4
137	{
138	GLfloat x, y, z, w;
139	vec4 () { };
140	vec4 (GLfloat s) : x(s), y(s), z(s), w(s) { };
141	vec4 (GLfloat x, GLfloat y, GLfloat z, GLfloat w) : x(x), y(y), z(z), w(w) { };
142	vec4 (const vec3 &v, GLfloat w = 1.F) : x(v.x), y(v.y), z(v.z), w(w) { };
143	};
144
145	// a generic plane
146	struct plane
147	{
148	vec3 n;
149	GLfloat d;
150
151	plane () { };
152	plane (GLfloat a, GLfloat b, GLfloat c, GLfloat d);
153	};
154
155	inline GLfloat distance (const plane &a, const point &p)
156	{
157	return dot (a.n, p) + a.d;
158	}
159
160	struct sphere {
161	point p;
162	GLfloat r;
163
164	sphere () { };
165	sphere (const point &p, GLfloat r) : p(p), r(r) { };
166	};
167
168	inline bool overlap (const sphere &a, const sphere &b)
169	{
170	GLfloat d = a.r + b.r;
171
172	return length2 (a.p - b.p) <= d * d;
173	}
174
175	struct cone {
176	point p;
177	vec3 a; // axis
178	GLfloat f, fs1, fc2; // angle
179
180	cone () { };
181	cone (const point &p, const vec3 &a, GLfloat f)
182	: p(p), a(a), f(f)
183	{
184	fs1 = 1.F / sinf (f);
185	fc2 = cosf (f); fc2 *= fc2;
186	};
187	};
188
189	inline bool overlap (const cone &c, const sphere &s)
190	{
191	vec3 d = s.p - c.p + c.a * (s.r * c.fs1);
192	GLfloat dd = dot (c.a, d);
193	return dd > 0.F && dd * dd >= length2 (d) * c.fc2;
194	}
195
196	void renormalize (sector &s, point &p);
197
198	struct colour
199	{
200	GLubyte r, g, b, a;
201	colour (GLfloat r = 1., GLfloat g = 1., GLfloat b = 1., GLfloat a = 1.)
202	: r(GLubyte (r * 255.F + .5F))
203	, g(GLubyte (g * 255.F + .5F))
204	, b(GLubyte (b * 255.F + .5F))
205	, a(GLubyte (a * 255.F + .5F))
206	{
207	}
208	};
209
210	struct tex2
211	{
212	GLfloat s, t;
213	tex2 () { };
214	tex2 (GLfloat s, GLfloat t) : s(s), t(t) { };
215	};
216
217	template<typename unused> class gltype_traits { };
218
219	template<> struct gltype_traits<GLfloat > { static const GLenum gltype () { return GL_FLOAT; } };
220	template<> struct gltype_traits<GLdouble> { static const GLenum gltype () { return GL_DOUBLE; } };
221	template<> struct gltype_traits<GLint > { static const GLenum gltype () { return GL_INT; } };
222	template<> struct gltype_traits<GLuint > { static const GLenum gltype () { return GL_UNSIGNED_INT; } };
223	template<> struct gltype_traits<GLshort > { static const GLenum gltype () { return GL_SHORT; } };
224	template<> struct gltype_traits<GLushort> { static const GLenum gltype () { return GL_UNSIGNED_SHORT; } };
225	template<> struct gltype_traits<GLbyte > { static const GLenum gltype () { return GL_BYTE; } };
226	template<> struct gltype_traits<GLubyte > { static const GLenum gltype () { return GL_UNSIGNED_BYTE; } };
227
228	template<typename vectype> class vector_traits { };
229
230	template<>
231	struct vector_traits<vec2>
232	{
233	typedef GLfloat basetype;
234	static const int dimension () { return 2; }
235	};
236
237	template<>
238	struct vector_traits<vec3>
239	{
240	typedef GLfloat basetype;
241	static const int dimension () { return 3; }
242	};
243
244	template<>
245	struct vector_traits<vec4>
246	{
247	typedef GLfloat basetype;
248	static const int dimension () { return 4; }
249	};
250
251	template<>
252	struct vector_traits<tex2>
253	{
254	typedef GLfloat basetype;
255	static const int dimension () { return 2; }
256	};
257
258	template<>
259	struct vector_traits<colour>
260	{
261	typedef GLubyte basetype;
262	static const int dimension () { return 4; }
263	};
264
265	struct box
266	{
267	point a, b;
268
269	box() { };
270
271	void reset ()
272	{
273	a = point ( FLT_MAX, FLT_MAX, FLT_MAX);
274	b = point (-FLT_MAX, -FLT_MAX, -FLT_MAX);
275	}
276
277	void add (const box &o);
278	void add (const point &p);
279	};
280
281	struct entity;
282	struct geometry;
283	struct view;
284	struct octant;
285
286	extern struct timer
287	{
288	static double now;
289	static double diff;
290	static double fps;
291
292	static void frame ();
293	timer ();
294	} timer;
295
296	/*
297	#define MAX_EVENT_TYPES 10
298	enum event_type { TIMER_EV };
299	struct event
300	{
301	event_type type;
302	};
303
304	typedef callback1<void, event&> event_cb;
305
306	class skedjuhlar
307	{
308	public:
309	// only 10 types for now
310	private:
311	vector <list<event_cb> > event_lists;
312
313	public:
314	skedjuhlar () {
315	event_lists.resize (MAX_EVENT_TYPES, list<event_cb>());
316	}
317
318	void register_event_cb (const event_type &t, const event_cb &e) {
319	event_lists[t].push_back (e);
320	};
321	void send_event (event &e) {
322	list<event_cb> &l = event_lists[e.type];
323	for (list<event_cb>::iterator it = l.begin (); it != l.end (); it++) {
324	(*it)(e);
325	}
326	};
327	void check_events () {
328	while (!events.empty ()) {
329	event &e = events.pop_front ();
330	list<event_cb> &l = event_lists[e->name];
331	for (list<event_cb>::iterator it = l.begin (); it !+ l.end (); it++) {
332	(*it)(e);
333	}
334	delete e; // ugly slow? hai hai..... 183G
335	}
336	}
337	};
338
339	extern skedjuhlar main_scheduler;
340	*/
341
342	namespace gl
343	{
344	#ifdef DEBUG
345	void errchk (const char name, const char args, const char *file, int line);
346	#endif
347
348	struct vertex_v3f
349	{
350	point p; // vertex
351
352	vertex_v3f () { };
353	vertex_v3f (point p) : p(p) { };
354
355	GLenum gl_format () const { return GL_V3F; }
356	};
357
358	struct vertex_t2f_n3f_v3f
359	{
360	tex2 t; // texture
361	vec3 n; // normal
362	point p; // vertex
363
364	vertex_t2f_n3f_v3f () { }
365	vertex_t2f_n3f_v3f (point p, vec3 n, tex2 t = tex2()) : p(p), n(n), t(t) { }
366
367	GLenum gl_format () const { return GL_T2F_N3F_V3F; }
368	};
369
370	GLsizei format_stride (GLenum format);
371	GLsizei format_offset_p (GLenum format);
372	GLsizei format_offset_n (GLenum format);
373	GLsizei format_offset_t (GLenum format);
374
375	struct index_ushort
376	{
377	GLushort i;
378
379	index_ushort () { }
380	index_ushort (GLushort i) : i(i) { }
381
382	GLenum gl_format () const { return GL_UNSIGNED_SHORT; }
383	};
384
385	struct matrix
386	{
387	GLfloat data[4][4];
388
389	const GLfloat operator ()(int i, int j) const { return data[j][i]; };
390	GLfloat &operator ()(int i, int j) { return data[j][i]; };
391
392	operator GLfloat *() { return &data[0][0]; }
393
394	void diagonal (GLfloat v);
395	void clear () { diagonal (0.F); };
396	void identity () { diagonal (1.F); };
397
398	void print (); // ugly
399
400	static matrix translation (const vec3 &v);
401	static matrix rotation (GLfloat degrees, const vec3 &axis);
402	static matrix scaling (GLfloat sx, GLfloat sy, GLfloat sz, GLfloat w = 1.F);
403
404	matrix () { };
405	matrix (GLfloat diag) { diagonal (diag); };
406	};
407
408	matrix operator *(const matrix &a, const matrix &b);
409	vec3 operator *(const matrix &a, const vec3 &v);
410
411	template<GLenum target>
412	struct vertex_buffer_object {
413	GLuint buffer;
414	GLenum format;
415	GLsizei count;
416
417	bool alloc ()
418	{
419	if (buffer)
420	return false;
421
422	glGenBuffersARB (1, &buffer);
423	return true;
424	}
425
426	void bind ()
427	{
428	glBindBufferARB (target, buffer);
429	}
430
431	template<class data>
432	void set (const data *d, GLsizei count, GLenum usage = GL_STATIC_DRAW_ARB)
433	{
434	alloc ();
435	format = d->gl_format ();
436	this->count = count;
437	vertex_buffer_object::bind ();
438	glBufferDataARB (target, count * sizeof (data), d, usage);
439	}
440
441	template<class data>
442	void set (const vector<data> &d, GLenum usage = GL_STATIC_DRAW_ARB)
443	{
444	set (&d[0], d.size (), usage);
445	}
446
447	void set (GLsizei bytes, GLenum usage = GL_DYNAMIC_DRAW_ARB)
448	{
449	alloc ();
450	format = GL_ZERO;
451	this->count = bytes;
452	vertex_buffer_object::bind ();
453	glBufferDataARB (target, count, 0, usage);
454	}
455
456	void *map (GLenum access = GL_WRITE_ONLY)
457	{
458	vertex_buffer_object::bind ();
459	return glMapBufferARB (target, access);
460	}
461
462	void unmap ()
463	{
464	vertex_buffer_object::bind ();
465	glUnmapBuffer (target);
466	}
467
468	vertex_buffer_object ()
469	: buffer(0)
470	{
471	}
472
473	~vertex_buffer_object ()
474	{
475	if (buffer)
476	glDeleteBuffersARB (1, &buffer);
477	}
478
479	operator GLint ()
480	{
481	return buffer;
482	}
483	};
484
485	struct vertex_buffer : vertex_buffer_object<GL_ARRAY_BUFFER_ARB> {
486	void bind ()
487	{
488	vertex_buffer_object<GL_ARRAY_BUFFER_ARB>::bind ();
489	if (format)
490	glInterleavedArrays (format, 0, 0);
491	}
492
493	void draw (GLenum mode, GLint first, GLsizei count)
494	{
495	bind ();
496	glDrawArrays (mode, first, count);
497	}
498	};
499
500	struct index_buffer : vertex_buffer_object<GL_ELEMENT_ARRAY_BUFFER_ARB> {
501	void draw (GLenum mode, GLint first, GLsizei count)
502	{
503	bind ();
504	glDrawElements (mode, count, format, (GLushort*)0 + first); // only SHORT supported :( // first //D//TODO
505	}
506	};
507
508	void draw_bbox (const sector &a, const sector &b);
509
510	}
511
512	GLuint SDL_GL_LoadTexture (SDL_Surface surface, GLfloat texcoord);
513
514	#endif
515